Final answer:
Yes, the advertisement contravenes the ACL as it does not disclose the expected increase in repayments after one to three years.
Step-by-step explanation:
Yes, the advertisement contravenes the Australian Consumer Law (ACL). Section 29(1)(e) of the ACL prohibits businesses from making false or misleading representations in relation to the price of goods or services. In this case, the advertisement did not disclose that the repayments could rise to just above $300 per week after one to three years, which is a significant increase from the initial $120-$140 weekly repayments. By not disclosing this information, the advertisement is likely to mislead consumers and therefore violate the ACL.